1. TECHNICAL DRAWING II Federico Fernndez HerreraENGLISH BILINGUAL 1 E.S.O.VISUAL AND PLASTIC EDUCATION DIDACTIC UNIT # 6

2. TECHNICAL DRAWING II* Drafts and sketches.* Drafting scale.* Diedric system. 3. TECHNICAL DRAWING II* Drafts and sketches DRAFT:Itisafreehanddrawing(justwithapencil).Weshow anideaorobjectwithouttotallydefiningit.WARNING:ADRAFTISNOTABADDRAWING,ASKETCHISNOTAGOODDRAWING! 4. TECHNICAL DRAWING II* Drafts and sketches: example of draft 5. TECHNICAL DRAWING II* Drafts and sketchesSKETCH: It is a free hand drawing too, but itincludes the measures, therefore it shows the precisesize and a shape similar to the final drawing. measure 6. TECHNICAL DRAWING II* Drafting scale:We define scale as the relation between the drawing size and thereal object. A model uses a reduction scale 7. TECHNICAL DRAWING II* Drafting scale:D:RDrawing size Real size 8. TECHNICAL DRAWING II * Drafting scale:Scale types:* Reduction scale: it is used to represent big objects,so they can be drawn on paperWe usually use: 1:2 1:5 1:10 In this example we have reduced 1000 times the real size of the tree.* Enlargement scale: it is used to represent smallobjectsso we can see them on paper- Itis used: 2:1 5:1 10:1 In this example the drawing is two times the real object. 9. TECHNICAL DRAWING II* Drafting scale: 2:1Scale 2:1Real 10. TECHNICAL DRAWING II* Drafting scale: 2:1Scale 1:2Real1:2 11. TECHNICAL DRAWING II* Drafting scale: 2:1Scale 1:4Real1:21:4 12. TECHNICAL DRAWING II* Diedric system: 13. TECHNICAL DRAWING II* Diedric system:The projection or VIEW consists of drawing just what we seewhen we are perpendicular to the object and to the plane 14. TECHNICAL DRAWING II* Diedric system:Todefineanobjectweonlyneed3views,floor,frontandprofile:Floorview:fromthetopoftheobjectFrontview:facingtheobject Floor viewProfileview:fromtheside Profile viewFront view Profile viewFront viewFloor view 15. TECHNICAL DRAWING II* Diedric system:Diedric RulesThe front is usually indicated with an arrowThe views distributionThe front is always on top of the floorThe profile is situated the other way round, that is, theleft profile is situated on the rightRight profilefrontfront Left profile floorfloor 16. TECHNICAL DRAWING II* Diedric system:Remember:Thesameheight:theobjecthasthesameheightonthefloorandontheprofileviewsThesamewidth:onthefrontandonthefloorviewsThesamedepth:onthefloorandontheprofileviews 17. TECHNICAL DRAWING II* Diedric system:Now try to figure out the views of this object. 18. TECHNICAL DRAWING II* Diedric system:This would be the result. 19. TECHNICAL DRAWING II* Activities:1. Draw a sketch of your home wardrobe (cupboard).2. What are the real dimensions of the car? (E 1:100).2.5cm 4.5cm3. Draw the front, left profile and floor views of your pencil marking the measures.4. Where do we have to be placed to see these objects like circles?